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Solution

MIG v1.73 used a different algorithm to generate x36 part designs.

In this algorithm, one set of 18 bits of data (Q) and the corresponding CQ were allocated into one bank, and the other set of 18 bits of data (Q) and the corresponding CQ# were allocated into the other bank.

Consequently, the DCI Cascade feature was not required.

Starting in MIG v2.0, x36 part designs are generated by allocating all 36 bits of data (Q) and the corresponding CQ and CQ# into one single bank.

As a result, the DCI Cascade feature is needed.

MIG v1.73

When a UCF and ".prj" file from a MIG v1.73 x36 memory part design are passed to update the UCF and generate the design, the Master Bank information is not provided.

Consequently, the generated design ".rtl" (design top file) has the parameter MASTERBANK_WIDTH value as "0".

To work around this issue, comment out the logic/ports related to the Master Bank.

These include the top-level parameter, MASTERBANK_WIDTH, and the top-level input pin, masterbank_sel_pin.

MIG v2.0

Although the MIG v2.0 ".prj" file has the DCI_Cascade enabled, it does not contain the Master Bank information.

To work around this issue, the following must be completed:

1. The number of Master Banks selected is represented by the parameter "MASTERBANK_WIDTH" in the design top ".rtl" file.

Edit this parameter accordingly.

2. The design top-level ".rtl" must include the input pin masterbank_sel_pin in the port list: